﻿/**
 * @license Copyright (c) 2003-2014, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or http://ckeditor.com/license
 */

/**
 * @fileOverview The "elementspath" plugin. It shows all elements in the DOM
 *        parent tree relative to the current selection in the editing area.
 */

(function () {
    var commands = {
        toolbarFocus: {
            editorFocus: false,
            readOnly: 1,
            exec: function (editor) {
                var idBase = editor._.elementsPath.idBase;
                var element = CKEDITOR.document.getById(idBase + '0');

                // Make the first button focus accessible for IE. (#3417)
                // Adobe AIR instead need while of delay.
                element && element.focus(CKEDITOR.env.ie || CKEDITOR.env.air);
            }
        }
    };

    var emptyHtml = '<span class="cke_path_empty">&nbsp;</span>';

    var extra = '';

    // Some browsers don't cancel key events in the keydown but in the
    // keypress.
    // TODO: Check if really needed.
    if (CKEDITOR.env.gecko && CKEDITOR.env.mac)
        extra += ' onkeypress="return false;"';

    // With Firefox, we need to force the button to redraw, otherwise it
    // will remain in the focus state.
    if (CKEDITOR.env.gecko)
        extra += ' onblur="this.style.cssText = this.style.cssText;"';

    var pathItemTpl = CKEDITOR.addTemplate('pathItem', '<a' +
        ' id="{id}"' +
        ' href="{jsTitle}"' +
        ' tabindex="-1"' +
        ' class="cke_path_item"' +
        ' title="{label}"' +
        extra +
        ' hidefocus="true" ' +
        ' onkeydown="return CKEDITOR.tools.callFunction({keyDownFn},{index}, event );"' +
        ' onclick="CKEDITOR.tools.callFunction({clickFn},{index}); return false;"' +
        ' role="button" aria-label="{label}">' +
        '{text}' +
        '</a>');

    CKEDITOR.plugins.add('elementspath', {
        lang: 'af,ar,bg,bn,bs,ca,cs,cy,da,de,el,en,en-au,en-ca,en-gb,eo,es,et,eu,fa,fi,fo,fr,fr-ca,gl,gu,he,hi,hr,hu,is,it,ja,ka,km,ko,ku,lt,lv,mk,mn,ms,nb,nl,no,pl,pt,pt-br,ro,ru,si,sk,sl,sq,sr,sr-latn,sv,th,tr,ug,uk,vi,zh,zh-cn', // %REMOVE_LINE_CORE%
        init: function (editor) {
            editor._.elementsPath = {
                idBase: 'cke_elementspath_' + CKEDITOR.tools.getNextNumber() + '_',
                filters: []
            };

            editor.on('uiSpace', function (event) {
                if (event.data.space == 'bottom')
                    initElementsPath(editor, event.data);
            });
        }
    });

    function initElementsPath(editor, bottomSpaceData) {
        var spaceId = editor.ui.spaceId('path'),
            spaceElement,
            getSpaceElement = function () {
                if (!spaceElement)
                    spaceElement = CKEDITOR.document.getById(spaceId);
                return spaceElement;
            },
            elementsPath = editor._.elementsPath,
            idBase = elementsPath.idBase;

        bottomSpaceData.html += '<span id="' + spaceId + '_label" class="cke_voice_label">' + editor.lang.elementspath.eleLabel + '</span>' +
            '<span id="' + spaceId + '" class="cke_path" role="group" aria-labelledby="' + spaceId + '_label">' + emptyHtml + '</span>';

        // Register the ui element to the focus manager.
        editor.on('uiReady', function () {
            var element = editor.ui.space('path');
            element && editor.focusManager.add(element, 1);
        });

        function onClick(elementIndex) {
            var element = elementsPath.list[elementIndex];
            if (element.equals(editor.editable()) || element.getAttribute('contenteditable') == 'true') {
                var range = editor.createRange();
                range.selectNodeContents(element);
                range.select();
            } else
                editor.getSelection().selectElement(element);

            // It is important to focus() *after* the above selection
            // manipulation, otherwise Firefox will have troubles. #10119
            editor.focus();
        }

        elementsPath.onClick = onClick;

        var onClickHanlder = CKEDITOR.tools.addFunction(onClick),
            onKeyDownHandler = CKEDITOR.tools.addFunction(function (elementIndex, ev) {
                var idBase = elementsPath.idBase,
                    element;

                ev = new CKEDITOR.dom.event(ev);

                var rtl = editor.lang.dir == 'rtl';
                switch (ev.getKeystroke()) {
                    case rtl ? 39 : 37: // LEFT-ARROW
                    case 9: // TAB
                        element = CKEDITOR.document.getById(idBase + (elementIndex + 1));
                        if (!element)
                            element = CKEDITOR.document.getById(idBase + '0');
                        element.focus();
                        return false;

                    case rtl ? 37 : 39: // RIGHT-ARROW
                    case CKEDITOR.SHIFT + 9: // SHIFT + TAB
                        element = CKEDITOR.document.getById(idBase + (elementIndex - 1));
                        if (!element)
                            element = CKEDITOR.document.getById(idBase + (elementsPath.list.length - 1));
                        element.focus();
                        return false;

                    case 27: // ESC
                        editor.focus();
                        return false;

                    case 13: // ENTER	// Opera
                    case 32: // SPACE
                        onClick(elementIndex);
                        return false;
                }
                return true;
            });

        editor.on('selectionChange', function (ev) {
            var env = CKEDITOR.env,
                editable = editor.editable(),
                selection = ev.data.selection,
                html = [],
                elementsList = elementsPath.list = [],
                namesList = [],
                filters = elementsPath.filters,
                isContentEditable = true,

                // Use elementPath to consider children of editable only (#11124).
                elementsChain = editor.elementPath().elements,
                name;

            // Starts iteration from body element, skipping html.
            for (var j = elementsChain.length; j--;) {
                var element = elementsChain[j],
                    ignore = 0;

                if (element.data('cke-display-name'))
                    name = element.data('cke-display-name');
                else if (element.data('cke-real-element-type'))
                    name = element.data('cke-real-element-type');
                else
                    name = element.getName();

                isContentEditable = element.hasAttribute('contenteditable') ?
                    element.getAttribute('contenteditable') == 'true' : isContentEditable;

                // If elem is non-contenteditable, and it's not specifying contenteditable
                // attribute - then elem should be ignored.
                if (!isContentEditable && !element.hasAttribute('contenteditable'))
                    ignore = 1;

                for (var i = 0; i < filters.length; i++) {
                    var ret = filters[i](element, name);
                    if (ret === false) {
                        ignore = 1;
                        break;
                    }
                    name = ret || name;
                }

                if (!ignore) {
                    elementsList.unshift(element);
                    namesList.unshift(name);
                }
            }

            for (var iterationLimit = elementsList.length, index = 0; index < iterationLimit; index++) {
                name = namesList[index];
                var label = editor.lang.elementspath.eleTitle.replace(/%1/, name),
                    item = pathItemTpl.output({
                        id: idBase + index,
                        label: label,
                        text: name,
                        jsTitle: 'javascript:void(\'' + name + '\')',
                        index: index,
                        keyDownFn: onKeyDownHandler,
                        clickFn: onClickHanlder
                    });

                html.unshift(item);
            }

            var space = getSpaceElement();
            space.setHtml(html.join('') + emptyHtml);
            editor.fire('elementsPathUpdate', {space: space});
        });

        function empty() {
            spaceElement && spaceElement.setHtml(emptyHtml);
            delete elementsPath.list;
        }

        editor.on('readOnly', empty);
        editor.on('contentDomUnload', empty);

        editor.addCommand('elementsPathFocus', commands.toolbarFocus);
        editor.setKeystroke(CKEDITOR.ALT + 122 /*F11*/, 'elementsPathFocus');
    }
})();

/**
 * Fired when the contents of the elementsPath are changed.
 *
 * @event elementsPathUpdate
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param data
 * @param {CKEDITOR.dom.element} data.space The elementsPath container.
 */
